Adjustable impact structure for electric tool

Abstract

The adjustable impact structure for the electric tool comprises an output shaft, an impact assembly and an adjusting assembly are arranged on the output shaft in a matched mode, and the impact assembly comprises a first cam, a second cam, a low-speed gear, a clutch cam and a high-speed gear which are arranged on the output shaft in a sleeved mode. The clutch cam is controlled to be connected with the low-speed gear or the high-speed gear through the gear shifting assembly, the adjusting assembly comprises a first fixing ring, a second fixing ring and a third fixing ring which are sequentially arranged on the output shaft in a sleeving mode, one end of the second fixing ring is sleeved with the first fixing ring, and the third fixing ring is elastically connected to the output shaft. A spring is arranged between the third fixing ring and the second fixing ring, clamping grooves are formed in the side face, facing the second fixing ring, of the third fixing ring at intervals, clamping blocks are correspondingly arranged on the second fixing ring, and the outer wall of the third fixing ring is further sleeved with a rotary knob. According to the utility model, through the matching design of the adjusting assembly and the impact assembly, an impact rotation or only rotation working mode can be accurately and flexibly carried out.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, specifically to an adjustable impact structure for power tools. Background Technology

[0002] Power tools are handheld or portable mechanized tools that use a motor to drive a working head through a transmission mechanism. Compared to traditional hand tools, their advantages lie in saving effort and increasing efficiency. There are many types of power tools, and different tools can be selected depending on the usage scenario and function. Impact drills are currently the most widely used power tools. An impact drill is based on a regular electric drill, but with the addition of a drive mechanism. Through the combination of ball bearings, gears, and other structures, it can reciprocate to strike the drill bit, making it easy to drill holes in hard objects. The drive mechanism of an impact drill typically consists of two impact gears interacting to achieve high-frequency back-and-forth striking.

[0003] For example, patent CN222359316U discloses a drill bit stabilization structure and an impact drill. The drill bit stabilization structure includes an impact drill bit, which comprises a rotating shaft, a clamping component, a bearing, and a shock-absorbing ring. The shock-absorbing ring and the bearing are respectively sleeved on the rotating shaft, which is connected to an external motor. The shock-absorbing ring and the bearing are also respectively connected to an external impact drill housing. The clamping component is located at the end of the rotating shaft. This impact drill uses the shock-absorbing ring to unload a portion of the rotating shaft's vibration force, reducing the impact of the rotating shaft's wobbling on the bearing.

[0004] Meanwhile, in order to improve the versatility of traditional impact drills, the aforementioned impact drill has two working modes: impact-rotation and rotation only, by setting a spring between the second impact member and the first impact member. Specifically, when the clamping member 12 is subjected to pressure and retracts into the housing 2, the second impact member 16 and the first impact member 15 overcome the elastic force of the spring 18 to make contact. Subsequently, when the second impact member 16 rotates with the rotating shaft 11, it can impact and rotate at the same time. When the pressure on the clamping member 12 does not completely overcome the elastic force and the second impact member 16 and the first impact member 15 make contact, the rotating shaft 11 only rotates.

[0005] Obviously, the above-mentioned impact drill's working mode switching does not have a specific and accurate adjustment structure. Instead, it changes based on the pressure on the clamping component 12 during operation. This obviously introduces uncertainties and uncontrollable problems, making it impossible to accurately adjust to the appropriate working mode for corresponding operations. This leads to instability in the use of power tools. Furthermore, placing the spring directly between the second and first impact components requires higher precision in the assembly of the two impact components and the spring. Otherwise, it will also affect the stability of the impact operation, and the spring is also prone to wear, increasing maintenance effort. Utility Model Content

[0006] The purpose of this invention is to provide an adjustable impact structure for power tools to solve the problems existing in the background art.

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0008] An adjustable impact structure for a power tool includes an output shaft that passes through a gearbox housing of the power tool. An impact assembly and an adjustment assembly are fitted onto the output shaft, with the impact assembly located inside the gearbox housing and the adjustment assembly located outside. The impact assembly includes a first cam, a second cam, a low-speed gear, a clutch cam, and a high-speed gear, all fitted onto the output shaft. The first cam is fitted onto the output shaft, the second cam is movably fitted onto the output shaft and fixed to the gearbox housing, and one side of the second cam forms an impact gap with the first cam. The clutch cam is fitted onto the output shaft via a transmission component. The low-speed gear and the high-speed gear... Located at both ends of the rotating component, and controlled by the shift assembly to connect the clutch cam with the low-speed gear or the high-speed gear, the adjustment assembly includes a first fixed ring, a second fixed ring, and a third fixed ring sequentially sleeved on the output shaft. The first fixed ring is connected to the gearbox housing, one end of the second fixed ring is sleeved inside the first fixed ring, and the third fixed ring is elastically connected to the output shaft. A spring is provided between the third fixed ring and the second fixed ring, and slots are provided at intervals on the side of the third fixed ring facing the second fixed ring. A corresponding locking block is provided on the second fixed ring. A knob is also sleeved on the outer wall of the third fixed ring. The low-speed gear and the high-speed gear are respectively meshed with the power drive assembly.

[0009] Preferably, the first cam is sleeved on the output shaft via a first spline sleeve, the second cam is provided with a connecting groove for engaging a low-speed gear, and three connectors extend from the outer wall of the second cam. The three connectors are respectively bolted to the gearbox housing. The clutch cam is sleeved on the output shaft via a second spline sleeve, the second spline sleeve is provided with a raceway, and the clutch cam is elastically provided with steel balls that roll on the raceway at intervals.

[0010] Preferably, the clutch cam is provided with connecting seats symmetrically at both ends, and one of the connecting seats is provided with steel balls that roll on the raceway at intervals. The low-speed gear and the high-speed gear are provided with connecting grooves with the same structure on the side facing the clutch cam, and the connecting seats and connecting grooves are engaged and locked together.

[0011] Preferably, the inner ring of the second fixing ring is provided with a groove at intervals, and the output shaft is provided with a steel ball corresponding to the groove; the inner ring of the third fixing ring is provided with a groove at intervals, and the output shaft is provided with a steel ball connected by an elastic element corresponding to the groove.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] (1) The impact structure of this utility model is concentrated on the output shaft, making the structure more compact. By fixing the second cam to the gearbox housing and the second cam being suspended on the outer wall of the output shaft, there is no direct contact between the two. When the first cam and the second cam reciprocate to perform impact work, the position of the second cam can be more stable, and there will be no risk of displacement or loosening, thereby improving the impact stability.

[0014] (2) By adjusting the design of the adjustment component, the axial movement of the output shaft can be adjusted. When the output shaft has a certain axial movement, the impact rotation mode can be realized through the cooperation of the impact component and the adjustment component. When the output shaft has no axial movement or very little axial movement, the output shaft can only rotate, that is, the impact mode is turned off and the drilling mode of rotation is performed. This allows for accurate and flexible adjustment of the working mode, enabling more effective working modes according to different operational needs, thus improving the flexibility and multi-functionality of use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the disassembled structure between the impact component and the output shaft in this utility model;

[0016] Figure 2 This is a schematic diagram of the disassembled structure between the adjustment component and the output shaft in this utility model;

[0017] Figure 3 This is a cross-sectional structural diagram of a portion of the present invention installed on a power tool.

[0018] In the attached image:

[0019] 1-Output shaft; 2-First cam; 3-Second cam; 4-Low speed gear; 5-Clutch cam; 6-High speed gear; 7-First retaining ring; 8-Second retaining ring; 9-Third retaining ring; 10-Spring; 11-Knob; 12-First spline sleeve; 13-Second spline sleeve; 14-Steel ball; 15-Connecting groove; 16-Gearbox housing; 301-Connector; 501-Connecting seat; 801-Clocking block; 802-Slide groove; 901-Clocking slot; 902-Groove; 1301-Race track. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example

[0022] like Figure 1-3 As shown, an adjustable impact structure for a power tool includes an output shaft 1, which passes through the gearbox housing of the power tool. An impact assembly and an adjustment assembly are fitted onto the output shaft 1, with the impact assembly located inside the gearbox housing and the adjustment assembly located outside. The impact assembly includes a first cam 2, a second cam 3, a low-speed gear 4, a clutch cam 5, and a high-speed gear 6, all sleeved on the output shaft. The first cam 2 is sleeved on the output shaft 1, and the second cam 3 is movably sleeved on the output shaft 1 and fixed to the gearbox housing. One side of the second cam 3 forms an impact gap with the first cam 2. The clutch cam 5 is sleeved on the output shaft 1 via a transmission component. The low-speed gear 4 and the high-speed gear 6 are respectively located on the rotating... The two ends of the component are connected to the clutch cam 5 and the low-speed gear 4 or the high-speed gear 6 through the shifting component. The adjustment component includes a first fixed ring 7, a second fixed ring 8 and a third fixed ring 9 sequentially sleeved on the output shaft 1. The first fixed ring 7 is connected to the gearbox housing. One end of the second fixed ring 8 is sleeved in the first fixed ring 7. The third fixed ring 9 is elastically connected to the output shaft 1. A spring 10 is provided between the third fixed ring 9 and the second fixed ring 8. The side of the third fixed ring 9 facing the second fixed ring 8 is provided with slots 901 at intervals. A corresponding locking block 801 is provided on the second fixed ring 8. A knob 11 is also sleeved on the outer wall of the third fixed ring 9. The low-speed gear 4 and the high-speed gear 6 are respectively meshed with the power drive component.

[0023] Working principle: By rotating knob 11, when the locking blocks 801 on the second fixed ring 8 align with the locking slots 901 on the third fixed ring 9, the axial movement of the output shaft 1 is large. When the outer end of the output shaft 1 touches the working carrier, it compresses the output shaft 1 inward, causing the third fixed ring 9 to press against the second fixed ring 8. Then, the spring 10 between the second fixed ring 8 and the third fixed ring 9 rebounds, thus causing the output shaft 1 to move axially. This causes the first cam 2 to collide with or disengage from the second cam 3, thereby forming a reciprocating impact operation, i.e., impact rotation. Functional mode: When the knob 11 is rotated until the locking block 801 and the locking slot 901 are misaligned, a very small gap is formed between the outer surface of the locking block 801 and the surface of the third fixing ring 9. That is, the axial movement of the output shaft 1 is very small. When the outer end of the output shaft 1 touches the working carrier, it is impossible to compress the output shaft 1 inward to make axial movement. That is, it is impossible to make the first cam 2 and the second cam 3 reciprocate the impact work. At this time, the output shaft 1 only performs the rotating drilling function. Moreover, through the cooperative design of high and low speed gears and clutch cam 5, the impact structure also has the function of speed regulation.

[0024] The impact structure of this invention is concentrated on the output shaft 1, making the structure more compact. By fixing the second cam 3 to the gearbox housing, and with the second cam 3 suspended above the outer wall of the output shaft 1 (i.e., there is no direct contact between them), the position of the second cam 3 is more stable when the first cam 2 and the second cam 3 reciprocate during impact work, preventing risks such as displacement or loosening, thereby improving impact stability. Through the design of the adjustment component, the axial movement of the output shaft can be adjusted, allowing the power tool to accurately and flexibly adjust its working mode. This enables more effective operation according to different work requirements, improving the tool's flexibility and versatility.

[0025] Furthermore, the first cam 2 is sleeved on the output shaft 1 via the first spline sleeve 12. The second cam 3 is provided with a connecting groove for engaging the low-speed gear 4, and three connectors 301 extend from the outer wall of the second cam 3. The three connectors 301 are respectively bolted to the gearbox housing. The clutch cam 5 is sleeved on the output shaft 1 via the second spline sleeve 13. The second spline sleeve 13 is provided with a raceway 1301, and the clutch cam 5 is provided with steel balls 14 that roll on the raceway 1301 at intervals. Connecting seats 501 are symmetrically provided at both ends of the clutch cam 5. One of the connecting seats 501 is provided with steel balls 14 that roll on the raceway 1301 at intervals. The low-speed gear 4 and the high-speed gear 6 are both provided with connecting grooves 15 with the same structure on the side facing the clutch cam. The connecting seats 501 and the connecting grooves 15 are engaged and locked together.

[0026] The above design, through the design of two spline sleeves and the connecting groove on the second cam 3, makes the fit between the impact components and between them and the gear shaft 1 tighter, and limits the distance between the high and low speed gears. At the same time, it also limits the position of the clutch cam 5 and the high and low speed gears after they are assembled, which can make the impact stability stronger. The design of the raceway 1301 on the second spline sleeve 13 and the fit design of the elastic steel ball structure on the clutch cam 5 can further prevent the clutch cam 5 from axially wobbling on the output shaft 1, thereby further improving the impact stability. The fit between the clutch cam 5 and the high and low speed gears can be adjusted by operating the shift component, thereby adjusting the working speed of the tool. The operation is convenient and can improve the flexibility of the tool. The second cam 3 has three connectors 301 at intervals. The connectors 301 are designed with holes for bolts and other connecting parts to pass through, which can make the connection between the second cam 3 and the gearbox housing more stable.

[0027] Furthermore, the inner ring of the second fixed ring 8 is provided with grooves 802 at intervals, and steel balls 15 are provided on the output shaft 1 corresponding to the grooves 802. The inner ring of the third fixed ring 9 is provided with grooves 902 at intervals, and steel balls 14 connected by elastic elements are provided on the output shaft 1 corresponding to the grooves 902. The above design, with the grooves 802 and steel balls 14, can improve the axial movement stability of the second fixed ring 8, that is, the stability of impact operation; the design of the grooves 902 and the elastically connected steel balls 14 facilitates the synchronous rotation adjustment of the third fixed ring 9 and the knob 11, improving the convenience and stability of operation.

[0028] It should be noted that this practical impact structure can be flexibly installed on different power tool housings, such as... Figure 3 As an example of installation on a power tool, the output shaft 1 is connected to the corresponding housing position of the power tool via a bearing. The shifting assembly that controls the clutch cam 5 and the drive assembly that controls the operation of the high and low speed gears can be flexibly designed and installed according to actual needs. During use, even if the power switch of the power tool is turned on, the output shaft 1 will not work as long as the outer end of the output shaft 1 does not touch the working carrier to apply force, which can also improve the safety of tool use.

[0029] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An adjustable impact structure for a power tool, comprising an output shaft passing through a gearbox housing of the power tool, characterized in that: An impact assembly and an adjustment assembly are fitted onto the output shaft. The impact assembly is located inside the gearbox housing, and the adjustment assembly is located outside the gearbox housing. The impact assembly includes a first cam, a second cam, a low-speed gear, a clutch cam, and a high-speed gear, all fitted onto the output shaft. The first cam is fitted onto the output shaft, and the second cam is movably fitted onto the output shaft and fixed to the gearbox housing. One side of the second cam forms an impact gap with the first cam. The clutch cam is fitted onto the output shaft via a transmission component. The low-speed gear and the high-speed gear are located at opposite ends of a rotating component and are controlled by a shifting assembly. The cam is connected to a low-speed gear or a high-speed gear. The adjustment assembly includes a first fixed ring, a second fixed ring, and a third fixed ring sequentially sleeved on the output shaft. The first fixed ring is connected to the gearbox housing. One end of the second fixed ring is sleeved inside the first fixed ring. The third fixed ring is elastically connected to the output shaft. A spring is provided between the third fixed ring and the second fixed ring. The side of the third fixed ring facing the second fixed ring has slots spaced apart. A corresponding locking block is provided on the second fixed ring. A knob is also sleeved on the outer wall of the third fixed ring. The low-speed gear and the high-speed gear are respectively meshed with the power drive assembly.

2. The adjustable impact structure for power tools according to claim 1, characterized in that: The first cam is sleeved on the output shaft via a first spline sleeve. The second cam is provided with a connecting groove for engaging a low-speed gear, and three connectors extend from the outer wall of the second cam. The three connectors are respectively bolted to the gearbox housing. The clutch cam is sleeved on the output shaft via a second spline sleeve. The second spline sleeve is provided with a raceway, and steel balls that roll on the raceway are elastically arranged at intervals on the clutch cam.

3. The adjustable impact structure for power tools according to claim 2, characterized in that: The clutch cam has symmetrical connecting seats at both ends. One of the connecting seats has steel balls that roll on the raceway at intervals. The low-speed gear and the high-speed gear have connecting grooves with the same structure on the side facing the clutch cam. The connecting seats and connecting grooves are engaged and locked together.

4. The adjustable impact structure for power tools according to claim 1, characterized in that: The inner ring of the second fixing ring is provided with a groove at intervals, and the output shaft is provided with a steel ball corresponding to the groove. The inner ring of the third fixing ring is provided with a groove at intervals, and the output shaft is provided with a steel ball connected by an elastic element corresponding to the groove.

Images